NOP - 2023 ARCADIA - Buzzpoints App

Question

You are building a basic CPU with a classic RISC pipeline. Answer the following about a seemingly harmless instruction you may use, for 10 points each.

[10m] Name this instruction, which can be used to implement a pipeline stall in certain architectures, including x86 and MIPS (“mips”). A “sled” or “slide” is named for this instruction, which does nothing when executed.

ANSWER: NOP [or no-op or NOOP or no operation]

[10h] In x86, a NOP is implemented by completing this atomic action equivalent to three MOV instructions on the AX register. This action can be used to implement a semaphore in x86 because it activates a bus lock.

ANSWER: XCHG [or exchanging two registers; accept descriptions of swapping the contents of two registers]

[10e] An attacker may install a NOP slide in memory while exploiting this type of vulnerability where the bounds of allocated memory are exceeded. A common coding website is named for this effect occurring to a stack.

ANSWER: overflow [or overrun; accept buffer overflow or buffer overrun; accept Stack Overflow]

<KJ, Other Science: Computer Science>

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Summary


2023 ARCADIA at UC Berkeley	Premiere	Y	2	15.00	100%	50%	0%
2023 ARCADIA at Carleton University	Premiere	Y	3	16.67	100%	67%	0%
2023 ARCADIA at Claremont Colleges	Premiere	Y	1	30.00	100%	100%	100%
2023 ARCADIA at Duke	Emory, Duke, Yale	Y	4	12.50	100%	25%	0%
2023 ARCADIA at Emory	Emory, Duke, Yale	Y	4	10.00	100%	0%	0%
2023 ARCADIA at Imperial	Imperial	Y	5	14.00	100%	20%	20%
2023 ARCADIA at Indiana	Premiere	Y	5	10.00	100%	0%	0%
2023 ARCADIA at Ohio State	Ohio State, Texas	Y	3	10.00	100%	0%	0%
2023 ARCADIA Online	Maryland, Online	Y	3	10.00	100%	0%	0%
2023 ARCADIA at RIT	Premiere	Y	2	15.00	100%	0%	50%
2023 ARCADIA at Texas	Ohio State, Texas	Y	3	10.00	100%	0%	0%
2023 ARCADIA at WUSTL	Premiere	Y	3	10.00	100%	0%	0%
2023 ARCADIA at Duke	Emory, Duke, Yale	N	2	20.00	100%	100%	0%
2023 ARCADIA at Emory	Emory, Duke, Yale	N	4	10.00	75%	25%	0%
2023 ARCADIA at Ohio State	Ohio State, Texas	N	2	15.00	100%	50%	0%
2023 ARCADIA Online	Maryland, Online	N	2	15.00	100%	50%	0%
2023 ARCADIA at Texas	Ohio State, Texas	N	3	16.67	100%	33%	33%
2023 BHSU @ Maryland	03/11/2023	N	1	10.00	100%	0%	0%
2023 BHSU @ Northwestern	02/25/2023	N	6	13.33	83%	50%	0%
2023 BHSU @ Waterloo	04/15/2023	N	3	6.67	67%	0%	0%

Data


Berkeley B	Berkeley A	0	0	10	10
Stanford A	Berkeley C	10	0	10	20
McDouble West-Carleton	Waterloo	10	0	10	20
Ottawa A	Ottawa C	0	0	10	10
Toronto Ray of Sun in the Sky	Ottawa B	10	0	10	20
Duke	James Madison A	0	0	10	10
James Madison B	North Carolina A	10	0	10	20
South Carolina A	North Carolina B	0	0	10	10
South Carolina B	NC State	0	0	10	10
I will play anything with a buzzer in front of me	SGV Capital	10	10	10	30
Emory A	Georgia Tech B	0	0	10	10
Tennessee A	Georgia Tech A	0	0	10	10
Imperial A	Imperial B	10	0	10	20
Oxford	Warwick	0	0	10	10
Chicago A	Indiana	0	0	10	10
Chicago B	Notre Dame B	0	0	10	10
Illinois B	Purdue A	0	0	10	10
Notre Dame A	Vanderbilt	0	0	10	10
Illinois A	Purdue B	0	0	10	10
Birmingham	Bristol	0	0	10	10
Cambridge B	Cambridge A	0	10	10	20
Edinburgh	Durham	0	0	10	10
Kenyon B	Team 2	0	0	10	10
Michigan B	Michigan A	0	0	10	10
Kenyon A	Ohio State A	0	0	10	10
RIT	Cornell R	0	10	10	20
Syracuse+Rochester	Cornell MATLAB	0	0	10	10
Texas B	HCC	0	0	10	10
TAG Magnet: Taylor's Version	TAMU	0	0	10	10
Texas A	Texas C	0	0	10	10
Missouri A	SIUE	0	0	10	10
WUSTL H2O	Missouri B	0	0	10	10
WUSTL XYZ	Squidward Community College	0	0	10	10
Boston College	Zen and the Art of Buzzing	0	0	10	10
Farrellmagnetism	Ganon Evans Fan Club	0	0	10	10
MSU A and Friend	Arizona State	0	0	10	10
Georgia Tech C	Georgia A	0	0	10	10
Georgia Tech D	Georgia B	0	0	10	10